Yes, he can do it by regulation, see:
http://www.federalistblog.us/2007/09/revisiting_subject_to_the_jurisdiction/
W H Y
N O T ??
According to the wording of 14th Amendment, he can.
Do it. Even if the Judiciary overturns it, it is a poltical battle worth fighting.
Some time in politics having the fight, even if you lose, is better then conceding the field to the enemy.
I was talking with someone whose parents were resident aliens. She was born here and is able to vote. All this needs to be clarified.
The Fake News is so fake. Just now listening to the ABC radio news report at the top of the hour and the reporter authoritatively reports, as if slam-dunk countering Trump’s plan as she just reported, states that the Constitution states...minus the “subject to the jurisdiction thereof” phrase.
BTW Rep Steve King has a good page online about the amendment: https://steveking.house.gov/media-center/columns/ending-birthright-citizenship-does-not-require-a-constitutional-amendment